You don't really
need lots of different cup burrs, I get along with just 1.2mm and 2mm, but that's just me
I have the sets of 23 and 14 ball burrs from rio grande and they have lasted me a loooooong time.
Don't despair though, I don't know whether you have to pay extra sales tax but at least you don't have to pay import VAT and customs fees on them. Us poor souls in the UK usually get a nice little card through the door telling us that we need to pay some crazy amount before we can get our nice parcel full of tools delivered. That said, it still works out cheaper for me to buy the sets from rio and they have larger sizes available (sorry Cookies lol).
I would definitely recommend getting a few single inverted cone burrs or cylinder burrs for when you're tube setting cabochons, it saves so much faffing around trying to get the pesky cabs to sit still.
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